Assume that the short-run cost and demand data given in the tables below confront a monopolistic competitor selling a given product and engaged in a given amount of product promotion. Cost Data Demand Data Quantity Total Output Total Cost Demanded Price $ 25 $ 60 1 40 1 55 2 45 2 50 3 55 3 45 4 70 4 40 5 90 5 35 115 6 30 If the firm sells 3 units of output, marginal revenue will be Multiple Choice $35 O $-5 $165 O $135